In 2007, the National Acoustic Laboratory tested 110mm thick Alphalite 12-01 Chaser masonry with various lining systems. Test 2057, with a 64mm independent stud wall system, achieved Rw + Ctr 50 (the BCA requirement for walls separating home units).

This wall also meets the BCA requirement to resist the transmission of impact-generated sound wherever an inter-tenancy wall separates a wet area (bathroom / laundry / kitchen etc) from a habitable room.

Alphalite Twinbrick masonry has 5% more mass per m² than the 12-01 Chaser. It was therefore assessed to perform as well as the Chaser block.

Both the Twinbrick and Chaser block exceed the BCA fire rating requirements for typical home unit walls before adding any lining system. All the home unit masonry can be done with either Twinbricks or Chaser blocks, avoiding the risk of using unrated masonry where fire or acoustic ratings are required.

Further tests and assessments identified other inter-tenancy wall (party wall) options: the innovative Continuous Stud-sheeting system uses metal sheeting in lieu of independent studs. This saves space, a valuable commodity in high-rise apartments. A 64mm stud, 20mm clear of the masonry takes 84mm of extra space.